#define _CRT_SECURE_NO_WARNINGS
#include "Stack.h"

void StackInit(ST* ps) {
	assert(ps);

	/*ps->a = NULL;
	ps->capacity = 0;
	ps->top = 0;*/

	ps->a = (STDataType*)malloc(sizeof(STDataType) * 4);
	if (ps->a == NULL) {
		perror("malloc fail");
		exit(-1);
	}
	ps->top = 0;
	ps->capacity = 4;
}
void StackDestory(ST* ps) {
	assert(ps);
	free(ps->a);
	ps->capacity = 0;
	ps->top = 0;
}

void StackPush(ST* ps, STDataType x)
{
	assert(ps);
	if (ps->capacity == ps->top) {
		STDataType* tem = realloc(ps->a,sizeof(STDataType) * ps->capacity * 2);
		if (tem == NULL) {
			perror("realloc fail");
			exit(-1);
		}
		ps->a = tem;
		ps->capacity *= 2;
	}
	ps->a[ps->top] = x;
	ps->top++;
}

void StackPop(ST* ps) {
	assert(ps);
	assert(ps->top > 0);
	ps->top--;
}
STDataType StackTop(ST* ps) {
	assert(ps);
	assert(ps->top > 0);
	return ps->a[ps->top - 1];
}
bool StackEmpty(ST* ps) {
	assert(ps);
	return ps->top == 0;
}
int StackSize(ST* ps) {
	assert(ps);
	return ps->top;
}